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Up to this point, Firefox Health Report has generated and submitted a random UUID with each upload. Generated UUIDs were stored on the client. During upload, the client asked the server to delete all old UUIDs. Well-behaving clients thus left at most one record/ID on the server. Unfortunately, clients in the wild have not been behaving properly. We are seeing multiple documents on the server that appear to come from the same client. Clients are uploading new records but failing to delete the old ones. These old, undeleted "orphan" records are severely impacting the ability to derive useful knowledge from FHR data because it is difficult, resource intensive, and error prone to filter the records on the server. This is undermining the ability for FHR data to be put to good use. This patch introduces a persistent client identifier. When the client is initialized, it generates a random UUID. That UUID is persisted to the profile and sent as part of every upload. For privacy reasons, if a client opts out of data submission, the client ID will be reset as soon as all remote data has been deleted. We still issue and send upload IDs. They exist mostly for forensics purposes so we may log client behavior and more accurately determine what exactly misbehaving, orphan-producing clients are doing. It is worth noting that this persistent client identifier will not solve all problems of branching and orphaned records. For example, profile copying will result in multiple clients sharing a client identifier. A "client ID version" field has been added to facilitate an upgrade path towards client IDs with different generation semantics. --HG-- extra : rebase_source : b761daab39fb07b6ab8883819d68bf53462314a0 |
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